Hi. We are having some problems related to triples deletion when the object is a literal string with no language. (We are using virtuoso 6.1.0.3126)
As an example consider the following. We clear the graph, them we insert a triple, we query the graph and we obtain the triple. Following we delete the triple we received feedback about the triple deletion, but if we query it again, the triple is still retrieved. See. sparql clear graph <http://localhost:9999>; sparql insert into graph <http://localhost:9999> {<http://localhost:9999/x> <http://www.w3.org/2000/01/rdf-schema#label> "test"}; sparql select * from <http://localhost:9999> {?s ?p ?o}; sparql delete from <http://localhost:9999> { <http://localhost:9999/x> < http://www.w3.org/2000/01/rdf-schema#label> "test" } where { graph < http://localhost:9999> { <http://localhost:9999/x> < http://www.w3.org/2000/01/rdf-schema#label> "test" } }; sparql select * from <http://localhost:9999> {?s ?p ?o}; The output is: Clear <http://localhost:9999> -- done No. of rows in result: 1 -------- Insert into <http://localhost:9999>, 1 triples -- done No. of rows in result: 1 -------- http://localhost:9999/x http://www.w3.org/2000/01/rdf-schema#label test No. of rows in result: 1 -------- Delete from <http://localhost:9999>, 1 triples -- done No. of rows in result: 1 -------- http://localhost:9999/x http://www.w3.org/2000/01/rdf-schema#label test No. of rows in result: 1 But if instead we insert a triple with the string literal object setting the language, everything works fine. See. sparql clear graph <http://localhost:9999>; sparql insert into graph <http://localhost:9999> {<http://localhost:9999/x> <http://www.w3.org/2000/01/rdf-schema#label> "test"@en}; sparql select * from <http://localhost:9999> {?s ?p ?o}; sparql delete from <http://localhost:9999> { <http://localhost:9999/x> < http://www.w3.org/2000/01/rdf-schema#label> "test"@en } where { graph < http://localhost:9999> { <http://localhost:9999/x> < http://www.w3.org/2000/01/rdf-schema#label> "test"@en } }; sparql select * from <http://localhost:9999> {?s ?p ?o}; Output is: Clear <http://localhost:9999> -- done No. of rows in result: 1 ------- Insert into <http://localhost:9999>, 1 triples -- done No. of rows in result: 1 ------- http://localhost:9999/x http://www.w3.org/2000/01/rdf-schema#label test No. of rows in result: 1 ------- Delete from <http://localhost:9999>, 1 triples -- done No. of rows in result: 1 ------- No. of rows in result: 0 Also works if instead of using a literal, we use a url. We observed the same problem when we modify the graph, which instead of modify the graph, only add the new triple value. We suppose this problem is related to triples deletion problem. Thanks. Z.
